Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc18fe8c4c38cdcf…

MALICIOUS

PDF

117.0 KB Created: 2021-09-03 07:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 283899a4f113f15535b01d4a5161399e SHA-1: f0f6e2477777c785903608963a464130980b32ca SHA-256: fc18fe8c4c38cdcf03b25834aef87f139b641b3df845701ea2791ff81b71e9b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to host further malicious content or phishing pages. The presence of multiple external URI and link farm indicators suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://tantusmarina.com/UserFiles/file/likuwig.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1736710f7a571c3f6821610a3a4a755b/21332371715.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609180b42aa31---sibalabowebiru.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/a9fgafljv2nqmuk5d0fk4j8oqc/29653944733.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/12134799684.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/87355087660.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/nugovigulaposifuti.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160942f62af9cf---4589080518.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/90658973169.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/s7sjjr27a9eum4osnfd4fdpdu0/5405024231.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/36206354884.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zisixinufimimu.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/31856809453.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/nozunemezuko.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0afd358548---sunuwiwej.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210804_CE5F7E3F0B2A65C9.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/3c676c65fd8a27f945c9a204ac90e45e/25911374573.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/kuwesovupobuvix.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/3eb6e5e1bf3565982cff29f894b30777/78605631069.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/gafezuvov.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pau4suihmf6m759846am58h1p2/gejugedaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=instructional+technology+and+media+for+learning+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001630c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1630C 18776 bytes
SHA-256: 309fb9b2ab715e35c28ba166f638e751614824c2a28a1cfd1184d1ed1520924b
font_01_sfnt_off000193f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ac07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC07 11232 bytes
SHA-256: c3e8fc2e2238fd99d93087085767e3d3e7b65003335216eb216645bb47289bfa

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